23
4.4 Outlet piping
It is important for the outlet piping to be correctly sized to prevent excessive backpressure
on the APT14, APT14HC or APT14SHC. This pipework should be sized to take into account
the effects of flash steam at the heat exchangers full load operating conditions and any
other equipment being discharged into the return line.
Note: A separate Spirax Sarco DN40 DCV10 check valve must be fitted to the outlet flange
of the pump body and the connecting pipework flange - APT14HC and APT14SHC only.
Ensure the DCV10 is mounted centrally between the flanges with the directional flow arrow
pointing in the direction of fluid flow. A gasket should be used both sides of the disc check
valve. For all other maintenance and technical information see IM-P601-32.
Motive IN
Strainer fitted with 100 mesh screen.
Note: The APT's are all supplied with a strainer close coupled
to the steam inlet connection.
Condensate outlet
Spirax Sarco sized length
of pipe to act as a reservoir
Balance
line
Exhaust
OUT
Condensate inlet
Strainer
Outlet DCV10 between flanges
(APT14HC and APT14SHC only)
An air vent must be fitted higher than the inlet to the process.
†
Fig. 13
*Trapped motive steam supply
Soft sealing flanged or screwed DCV
0.2 m
(8")
It is recommended that the reservoir be installed at least 1 pipe diameter below the
process outlet, but as high as possible above the APT14, APT14HC or APT14SHC inlet.
† Minimum installation head
0.2 m (8") from base of pump.
Recommend minimum 0.3 m,
maximum 1 m.
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